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Pafi 22nd February 2008 09:20 AM

RJH3047 (IGBT) datasheet wanted
2 Attachment(s)
And RJP3043 too. These are 300 V IGBT-s, I'd like to use them in ClassD amp, but I don't know even the manufacturer of them.

I measured already most of DC parameters, but detailed switching parameters are needed (Eoff, Qrr of diode, stb...).

Pafi 22nd February 2008 09:21 AM

2 Attachment(s)
I'm searching info about 2 other IGBT also. They are IXYS made, but I don't find them on the official homepage. IXGP70N33TBM-A

Pafi 22nd February 2008 09:23 AM

2 Attachment(s)

Eva 22nd February 2008 10:00 AM

Where did you get these IGBTs? Are they semi-custom parts being used by some amplifier manufacturers in agereement with semiconductor brands before they are released to the general public? :D

Pafi 22nd February 2008 10:17 AM

I dismounted them from some rejected PCB from Samsung. It wasn't an amplifier, nor an SMPS, I guess it was a driver of some kind of big display, or vehicle. They seem to be new development indeed, but unfortunately not especially for audio.

Shortcircuit 22nd February 2008 11:17 PM

Hi Pafi!
I found similar one : IXGQ90N27PB
IXGP and IXGA parameters is equal. (the difference is the package)
IXYS don't like to notify Qrr in body diode. :(
Probe it, be brave...

Pafi 23rd February 2008 09:32 AM


Thanks! Sadly this has too high fall time for audio.

I've tried some of them (RJ...), and they weren't good enough (eg. too high switching loss -> damaged at about 25...30 A peak current), but I think if I saw the datasheet, maybe I could figure out what to modify to reach a little higher efficiency.

I saw so many potencial in RJP3043! Vcebr=360V, Vce=1.5V @ 16A, tdon=20 ns, tdoff=60 ns, Qg=~30 nC... but current "tail" seems to be too long.

Shortcircuit 23rd February 2008 10:34 AM


Originally posted by Pafi
I've tried some of them (RJ...), and they weren't good enough (eg. too high switching loss -> damaged at about 25...30 A peak current)
what kind of the swicthing freq. ?
The RJ...s may be good for classD subwoofer amp with lower Fsw. (around 100-150kHz)
Did you probe IXGP70N33 ? looks more useful the TO220 package IGBT.

Pafi 23rd February 2008 02:27 PM

Unfortunately the switching freq was not fixed, so I can tell only the idle freq: 200 kHz, but this is somewhat irrelevant.

I didn't try IXGP70N33, mainly because the isolated package can dissipate very little power. I'm planning to remove isolation from the bottom... This has an ultra low saturation voltage (1V @ 16A), so I'm going to use in (resonant) power supply instead of in amp. I don't think it would be fast enough.

RJ...s are usable in sub amp, but worse than the previously used HGTG12N60A4D. :(

gunden 21st May 2008 05:22 PM

hello i need gp70n33 please could you help me

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